Valve.



PATENTED JULY 2, 1907. H. P. TIPPETT.

VALVE. APPLIOATION mm) 11017.26, 1906.

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HAROLD P. TIPPETT, OF COLUMBUS, OHIO.

VALVE.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed November 26,1906. Serial No. 345,025.

To all whom it may concern:

Be it known that I, IIAROLD P. TIPPETT, a citizen of the United States,residing at olumbus, in the county of Franklin and State of Ohio, haveinvented certain new and useful Improvements in Valves, of which thefollowing is a specification.

My invention relates to valves and particularly to a valve forcontrolling steam under pressure, the initial movement of which iscontrolled from the exterior of the valve casing, but the final movementof which is completed by thepressure of the steam which said valvecontrols. p

A further object of the invention is the provision of a valve of thischaracter constructed to open very rapidly for the purpose hereinafterset forth.

Further objects and advantages of the invention will be set forth in thedetailed description which now follows.

In the accompanying drawing: Figure 1 is a detail view of a portion of afurnace illustrating the application of my improved valve, and, Fig. 2is a detail sectional view of said valve.

Like numerals designate corresponding parts in both of the figures ofthe drawing.

Referring to the drawing, the numeral 5 designates a furnace. A chute Gconducts coal to this furnace from any suitable source of supply and asteam blast for distributing this coal is conducted through a pipe 7 inthe usual and well known manner. The valve forming the subject matter ofthis invention is designed to control this blast and is constructed toopen so quickly that the full force of the blast is receivedinstantaneously at the nozzles.

It will readily be understood that if these valves opened slowly and theblast reached the pile of coal gradually, while this blast would startthe coal moving, it would not carry it to the rear portion of thefurnace, but said coal would bank up at the forward portion'of thefurnace. A quick opening of this valve is therefore a very importantelement in the successful operation of a device of this character.

The devices for imparting movement to this valve, do not form any partof the present invention, but a portion of these devices have beenillustrated in Fig. 1 of the drawing to make clear the operation andapplication of the valve. In this figiu'e the numeral 8 designates arotative disk to which power may be applied from any suitable motor.This disk carries a finger 9 which is adapted to engage with the beveledend 10 of a bell crank lever 11, said lever being pivoted as at 12. A.short arm 13 of this lever is pivoted as at 14 to the valve stem 15 ofthe valve which forms the subject matter of the present invention. Thisvalve comprises a casing 16 which is divided into a central chamber 17and a somewhat smaller chamber 18. The

branch 19 of the steam supply pipe is threaded into the casing at 20 andadmits steam to the chamber 17 through a port 20 Mounted forreciprocatory movement in this chamber is a valve, which comprises astem 21, a piston 22 which is carried by the upper end of this stem andfits snugly within the chamber 17 and a somewhat smaller piston 23 whichis carried upon the lower end of the stem and fits snugly within thechamber 18. The pipe 7 is threaded into the valve casing at 24. Acomparatively minute exhaust port 25 leads from the upper portion of thechamber 17 to the exterior of the valve casing. Mounted upon the lowerend of the valve stem 15 is a valve 26 which is normally held upon itsseat by a spring 27. This valve stem passes through a suitable stufiingbox 28 of the usual and well known construction and which requires nofurther description. Steam passes to a chamber 29 in which the valve 26is located, through a by-pass 30.

The operation of the device is as follows: Rotation having been impartedto the disk 8, the trip finger 9 is carried bodily around. When thebeveled end of this trip finger contacts with the beveled end 10 of thebell crank lever 11, said bell crank lever is rocked upon its pivot 12to lift the valve stem 15. Thisresults in lifting the valve 26 from itsseat. Since the area of the underside of the piston 22 exceeds the areaof the upper face of the piston 23, it follows that the pressure in thechamber 17 will when the valve 26 is seated, hold the main valve in theposition illustrated in Fig. 2, at which time communication between saidchamber and the pipe 7 is closed by the piston 23. When the valve 26 islifted from its scat against the tension of the spring 27 in the courseof the rotation of the disk 8, steam flows through the bypass 30 andchamber 29 to the upper portion of the chamber 17. The pressure upon theupper face of the piston 22 combined with the pressure upon the uppersurface of the piston 23 is sufficient to overcome the pressure upon theunderside of the piston 22 and causes the main valve to move downwardwith a very quick movement. This downward movement of the main valve,brings the piston 23 below a port 31 and establishes communicationbetween the chamber 17 and the pipe 7.

It will readily be understood that the duration of the blast may bedetermined by the adjustment of the tripping finger 9. If this finger beadjusted to such position that only the extreme point thereof, contactswith the beveled end of the bell crank lever 11, the blast will be ofvery short duration, while if this finger be adjusted to such positionthat practically the whole of the beveled surface-of the lower endthereof, contacts with the beveled upper end of the bell crank lever 11,the blast will be of longer duration. This fluid controlling valve isconstructed to open so quickly that the full force of the blast isreceived instantaneously at the nozzles, for the main valve movesdownward with great rapidity when steam is admitted upon the top of thepiston 22.

From the foregoing description, it will be seen that simple andefficient means are herein provided for accomplishing the objects of theinvention, but while the elements shown and described are well adaptedto serve the purposes for which they are intended, it is to beunderstood that the invention is not limited to the precise constructionset forth, but includes within its purview such changes as may be madewithin the scope of the appended claims.

What I claim, is:

In a valve for controlling fluid under pressure, the combination with acasing divided into a large chamber and a smaller chamber, of a pistonvalve comprising a stem, a piston of equal diameter with and travelingin the large chamber, said piston being carried by said stem, :1 secondpiston also carried by said stem of equal diameter with and traveling inthe smaller chamber, said casing having an inlet port adapted to admitfluid under pressure to the larger chamber between said pistons andhaving a discharge port adapted to deliver fluid under pressure from thesmaller chamber, a cap for the valve casing, a chamber formed in saidcap, a port establishing communication between the last named chamberand the upper portion of the large chamber of the Valve, a springcontrolled valve adapted to be actuated from the exterior of the casingwhich normally closes said port, an exhaust port which establishescommunication between the upper portion of the large chamber of thevalve casing and the atmosphere, and a bypass establishing communicationbetween the chamber of the cap and the inlet port of the main casing.

In testimony whereof I affix my signature in presence of two witnesses.

HAROLD P. TIPPETT.

Witnesses FRANK G. CAMPBELL, L. CARL STOUGIITON.

